Free fall of concrete - Concrete pour over a standing water in a caisson 3

• Nov 23, 2020

3
• #2

miningman

Mining

Feb 26, 2003

957

Dont try it!!! Use a tremmie

 

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• Nov 23, 2020

• #3

LittleInch

Petroleum

Mar 27, 2013

22,602

You need to make your caisson less porous.

Or get bigger pumps.

More details needed.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

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• Nov 23, 2020

• #4

jayrod12

Structural

Mar 8, 2011

6,277

agree with miningman, tremie the concrete in. Essentially this is a pipe that you start at the bottom of your caisson and pump the concrete in under the water. As the concrete fills the caisson hole, it will push the water up.

 

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• Nov 24, 2020

• #5

jimstructures

Structural

May 6, 2009

389

ebooya,

I agree with miningman & Jayrod12, use a tremmie to place the concrete below the water surface.

As you place the concrete raise the bottom of the tremmie pipe (maybe a canvas tube) as the concrete is placed. Always keep the bottom of the tremmie tube below the top of the new concrete so there is a seal.

Any contractor who wants to bid on the job should be familiar with the concept.

Jim

 

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• Nov 24, 2020

• #6

hokie66

Structural

Jul 19, 2006

23,206

It's tremie, not tremmie. And that is the method you have to use if you want sound concrete placement under water. Never heard of a canvas tube being used, but maybe...

The basics here:

https://en.wikipedia.org/wiki/Tremie

 

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• Nov 24, 2020

• Thread starter
• #7

ebooya

Civil/Environmental

Nov 23, 2020

2

Thank you all for your feedback and your responses. I appreciate it.

 

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• Nov 26, 2020

• #8

chicopee

Mechanical

Feb 15, 2003

6,199

Your are better off to dewater your cofferdams with submersible pumps before the concrete pours. The tremie pours we did were to seal up the bottom of the cofferdams before the concrete pours.

 

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• Nov 29, 2020

• #9

dik

Structural

Apr 13, 2001

26,063

I've done fully submerged coffer dams by tremie method...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

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